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Finding the Fourth Proportional to 979.31, 1,351.44 and 553.90

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Solution

The fourth proportional to 979.31, 1,351.44 and 553.90 is: 764.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.31 : 1,351.44 = 553.90 : x
  2. Step 2: Convert to fraction form
    979.31/1,351.44 = 553.90/x
  3. Step 3: Cross multiply
    979.31x = 1,351.44 × 553.90
  4. Step 4: Simplify right side
    979.31x = 748,562.62
  5. Step 5: Solve for x
    x = 748,562.62/979.31
  6. Step 6: Final answer
    x = 764.38

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.